Shuttle- Leading region not getting refreshed

Hello,

I am using Shuttle region in my OAF page which is dependent on an LOV value.

But when i select my LOV value the vo.execute qwery gets fired but still my OAF page dosent show the correct leading list (shuttle).

Please help me with a solution or can anyone send me a sample code related to my issue to refer .

Thanks.

Code:

AM Method which is appending a filter to Shuttle VO

    public void initXXAL_RespShuttleVO(String OUstr)

    {

        OAViewObject viewOb = getXXAL_RespShuttleVO1();

        viewOb.setWhereClause(null);

        viewOb.setWhereClause("NAME = :1");

        viewOb.setWhereClauseParam(0,OUstr);

        viewOb.executeQuery();  

        System.out.println("Shuttle VO query : "+viewOb.getQuery());